The Nixie tube, a product from the last century, predates most of the electronics you tinker with, and there is a good chance it predates you :)

Nixie tubes are extremely rare in the market, since they have been out of production for some time. Driving them from your Arduino has always been a task... but not anymore!

This Nixie module for Arduino makes it possible to drive the Nixie
tube directly. This classic Nixie tube combines a ceramic tube base,
gold‐plated PCB, and an RGB background LED.

This module can be used in a
variety of applications. It is an all‐in‐one design. Booster circuit,
driver, and plug sockets are integrated. Several modules can be plugged
in serial for customized needs. This makes controlling the Nixie modules
much easier from an Arduino, and other similar platforms. Users
can focus on the presentation and application, and not spend all of the time sourcing the tubes and worrying about
the voltage management or connections. A Nixie clock is just 4 or 6 Nixie tube away!

Cautions:The voltage on board is over
170Vdc when working. Do NOT touch inside the crylic board if you do not
know what you are doing.